Leonardo DiCaprio and Martin Scorsese are taking their Dr. H.H. Holmes project to the small screen.

The Revenant actor picked up the screen rights to Erik Larson’s 2003 book, The Devil in the White City: Murder, Magic And Madness At The Fair That Changed America, through his Appian Way production company back in 2010 and Scorsese signed on to direct the actor as the serial killer in 2015.

However, the project has yet to come to fruition on the big screen and now bosses at Paramount TV have announced it will hit streaming service Hulu as a series, which will be executive produced by DiCaprio and Scorsese. It is unclear if the actor will still be featured as Holmes.

Dr. Henry Howard Holmes, originally born as Herman Webster Mudgett.

The serial killer reportedly murdered 27 people in Chicago in the late 1800s, although later estimates suggested the death toll was closer to 200.

The project marks frequent collaborators DiCaprio and Scorsese’s eighth project together — they first teamed up for Gangs of New York in 2002, and they went on to collaborate on The Aviator, The Departed, Shutter Island, and 2013’s The Wolf of Wall Street. They also teamed up for The Audition, a short film released in 2015 as promotional material for casinos in Macau, China and Manila, Philippines.

And in addition to the Holmes project, they are collaborating on an adaption of The Lost City of Z author David Grann’s Killers of the Flower Moon: The Osage Murders and the Birth of the FBI.

The bestselling book, which was released in April, 2017 centres on a string of murders on the Osage Nation reservation in Oklahoma in the 1920s, after oil was discovered beneath the Native American tribe’s land. The cases were among the newly-established FBI’s first big homicide investigations.

DiCaprio will also star as U.S. President Theodore Roosevelt in Scorsese’s Roosevelt.